WASET
    H. L. Yim and  S. H. Lee and  S. K. Yoo and  J. J. Kim,  A Zero-Cost Collar Option Applied to Materials Procurement Contracts to Reduce Price Fluctuation Risks in Construction.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2011, vol. 60(12). 1769 - 1774
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/2482.